Collaboration: Professional Lifecycle Experience add Enhance Search

[joelcarr]

This PR is showing the changes in the feature branch made for @Financial-Times/professional-lifecycle-experience team to make relevant changes to enable the Enhance Search A/B test in Customer Products. This feature branch will be used to release beta versions of Page Kit to be used for the A/B test.

Any new changes should be made as PRs to this feature branch. This branch will have the same branch protections as main.

@Financial-Times/professional-lifecycle-experience will make changes will only do the following:

• Enable the enhance search to render in the header depending on the value of a feature flag
• Enable the ability to toggle the show state of the search bar on render

This PR will be blocked from merging into main. These changes are experimental and are owned by @Financial-Times/professional-lifecycle-experience. It is their responsibility to ensure the code works for the User Facing systems this code will be used for.

To release a beta version:

• Go to https://github.com/Financial-Times/dotcom-page-kit/releases/new?target=CPP-1662-professional-enhance-search-collaboration
• Make sure the target is set to CPP-1662-professional-enhance-search-collaboration
• Set the tag as v9.0.0-beta.0 (and then increment the last digit, so the next release will be v9.0.0-beta.1)
• Write release notes (click on Generate release notes button)
• Check Set as a pre-release
• Uncheck Set as a latest release

When the experiment is done

The code for this experiment will not be merged into main. Once the A/B test is concluded, we should plan fresh how to enable enhance search into the Header with the idea it is used supported in Origami.